Questions tagged [linear-motion]
The linear-motion tag has no usage guidance.
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Generate trajectory between 2 points to achieve a desired momentum
I need to plan path for robotic arm(having a tennis racquet as end-effector) whose aim is to hit a tennis ball in a specific direction(to return ball to the opponent). Now I have an algorithm which ...
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How does the thrust rating of a push rod/linear actuator (I've seen it in both kg and N) relate to the amount of weight it can move?
I'm working on a custom RC project, and I'm needing to move a lever with a "weight" of 5 lbs. 5 lbs is required to actuate the lever, and I need to push it 5 mm. Gravity does not affect the ...
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Autonomous vehicle lateral control
I am working on a control system for autonomous vehicles, i am using a kinematic bicycle model simulated on matlab simulink and the formula i used for the steering angle is given in the figures below ...
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VDI Guideline 2143 Sheet 1: Motion rules for cam mechanisms; theoretical fundamentals
Hello Motion Control Enthusiast, I am a motion control student, and looking for your suggestion for a Free downloadable English-translated version of VDI Guideline 2143, theoretical fundaments of cam ...
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In a lead screw mechanism with a fixed travelling nut, will the screw and its driving mechanism move instead?
https://www.youtube.com/shorts/tUkkOStjz8o
Imagine this but upside down.
Since the platform bolted to the travelling nuts will be pressed against the ground and will have nowhere to go, I reckon the ...
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Accelerate an object in a current-carrying coil
I'm currently trying to come up with some concept ideas for a physics game / riddle. The player has to get an object from one side of a horizontal, current-carrying coil to the other end of the coil ...
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Method to achieve a constant force no matter the actual velocity when under load
So, this might be a somewhat strange need, as I don't seem to see many resources on this. I'm trying to create a device where I can set an amount of force for it to generate, and when it would behave ...
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Reciprocating motion in alternating tracks
I’m trying to find a solution for a simple feeder mechanism where a spring-loaded ”piston” gets pushed in a linear motion, and then on the way back it switches to parallel track, enabling it to be ...
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High speed linear actuator/motor design
I need to make a linear actuator to compress a spring 80mm in 0.1 seconds. This is a speed of 1600mm/s. It takes around 15kg of force to compress the spring. How can I design a linear actuator for ...
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Linear actuator that extends more than its retracted size
I'm trying to build my standing desk and has been studying a lot of them, but have not found a CAD or Technical Drawing of them mechanism. Obviously, as an Engineer, I assume that it uses a Lead Screw ...
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What motors would be suitable for linear actuation in 1-2mm footprint?
I need to control simple braille (text for blind people) array with tiny rods. I don't necessarily have to control the precise location. A linear actuator with on/off states would be enough. However, ...
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Using a Lead Screw To Create a Two Stage Clamping System
I want to use a motor to drive a lead screw that first brings down a platform that locks into place and then controls a secondary platform to apply pressure but using only a single motor.
As an ...
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Is there a rotational-to-linear machine that doesn't allow the slider to impart torque while _between_ extremes?
Consider a machine for converting rotational motion to rectilinear translation, such as a crank slider or scotch yoke.
When the slider is at either of its two translational extremes (where the crank ...
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Rotation of point in 3D space
I want to rotate a point (3,4,5) by an angle 45 degrees(0.785398 rad) in 3D space. I have used the standard DCM matrix in the order Rx, Ry and Rz.
Where,
$\theta = 0.785398 [rad]$
$$ Rx= \begin{...
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Lifting a table using linear rails and linear actuators
I'm trying to design a coffee table for a tightly constrained space that can lift up to become a dining table. I've drawn the CAD for this design, but I'm concerned that the moment arm on the linear-...
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Driving an air cylinder with ignited hydrogen/oxygen gas mixture from fuel cell?
Summary:
I need to build a linear actuator that has a very fast actuating speed but fits in a very small space.
My Question/Idea:
Electric gearmotors, c02, and air pressure, are all ideas that come to ...
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Simple mechanism to convert linear motion into 180 degrees rotation
I want a simple mechanism to rotate something 180 degrees when another thing moves linearly past/through it. The below is what I have, but it can only work with an offset, so the movement is never ...
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How to achieve sliding motion like this between two blocks?
I want to make a construction of two boxes, that by default would be stacked one on top of the other, but linked in a way that would allow the top box to slide off and then move down so that they are ...
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Understanding the importance of 'pitch': For ball screws and timing belts
I searched here and even asked at McMaster-Carr, but even they couldn't provide an answer for me--
So, say you have either a ball-screw, or a timing belt-- Of course, in either case, having the right ...
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Determining the balancing force for a system of unequal masses for given scenario (angular-momentum, moment-of-inertia, thought-experiment)
Have already asked this on physics-site but has been closed.
As such trying here!
This question is basically a thought experiment.
Let's say there are two pulley's P1 and P2 having equal radius R and ...
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Looking for a mount with 3D play to it
I'm building a lift bed in a van. The basic idea is that each corner of the bed is mounted on a linear track actuator, bed goes up, bed goes down.
I want to be able to control each actuator ...
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How do you make custom springs and where could you buy them?
A friend and I are working on a combat robot that uses a special drive. This drive requires a spring with a large wire diameter (over 3mm), a large outer diameter (40-70mm), and a large pitch (60-90mm)...
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Looking for a linear actuator that can carry a transverse load? Does such a product exist?
I am looking for a product that works like a linear actuator where you can control how far it extends but it can also hold a transverse load at the furthest point of extension.
What I am looking for ...
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How do linear guides work?
I am new to the office and I wanted to ask about linear guides like shown in the picture:
(source: https://www.nskeurope.de/de/linear-motion-control/products/linear-guides.html)
Are the carriages able ...
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Differential Drive Kinematic Constraint Determination
I'm working through a paper to better understand Differential Drive Mobile robots and I'm a bit stuck(fairly early in the paper) on how one of the constraints is derived.
The paper is here, https://...
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To design the system of a rectangular small shaft moving in and out in a completely mechanical way without remote control
In my setup , I have designed a system in which a body will rotate and execute rectilinear motion down the screw along its thread . upon reaching the bottom most point I want to make a system in which ...
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Design of a linear actuator that is only 5 mm wide
I have to design a linear actuator with a maximum movement of 3 cm back and forth and a maximum force of 5 N. The only constraint I have is that it can only be 5 mm wide. There's no real constraint ...
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Spring and damper in series, equation of motion
For the motion in fig 4.1 (a), please check the description of this system in the images above, everything should be there. I get it, assuming the positive direction is downward, the spring tension is ...
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how are larger leadscrews (14mm diameter and up) fixed in place?
So looking at 12mm lead screws and below, it seems like a common method for fixing them in place is to use pillow blocks. The pillow block has set screws which clamp onto the lead screw, and you're ...
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I'm trying to understand an equation from a motor simulation $\dot w_i (u_ i ,w_i,l _i , \dot l _ i )$
I have a simulated motor and I'm not understanding the math to control it.
This is the equation for the force of the motor, also called an 'actuator'.
$\dot w_i (u_ i ,w_i,l _i , \dot l _ i )$
w ...
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